语法与词汇 6.In this factory the machines are not regulated______but are jointly controlled by a central computer system.
【正确答案】 B
【答案解析】B项individually意为“单独地”,与后面的jointly相呼应;A项independently意为“独立地”;C项irrespectively意为“不顾切地”;D项irregularly意为“不定期地;不规则地”。